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Places in Middle-earth

Mount Rerir

Description: "Now the people of Caranthir dwelt furthest east beyond the upper waters of Gelion, about Lake Helevorn under Mount Rerir and to the southward; and they climbed the heights of Ered Luin and looked eastward in wonder, for wild and wide it seemed to them were the lands of Middle-earth."
From The Silmarillion, Quenta Silmarillion, Ch 13, Of the Return of the Noldor

"Gelion was a great river; and he rose in two sources and had at first two branches; Little Gelion that came from the Hill of Himring, and Greater Gelion that came from Mount Rerir...
"Between the arms of Gelion was the ward of Maglor, and here in one place the hills failed altogether: there it was that the Orcs came into East Beleriand before the Third Battle. Therefore the Noldor held strength of cavalry in the plains at that place; and the people of Caranthir fortified the mountains to the east of Maglor's Gap. There Mount Rerir, and about it many lesser heights, stood out from the main range of Ered Lindon westward; and in the angle between Rerir and Ered Lindon there was a lake, shadowed by mountains on all sides save the south. That was Lake Helevorn, deep and dark, and beside it Caranthir had his abode; but all the great land between Gelion and the mountains, and between Rerir and the River Ascar, was called by the Noldor Thargelion, which signifies the Land beyond Gelion, or Dor Caranthir, the Land of Caranthir; and it was here that the Noldor first met the Dwarves. But Thargelion was before called by the Grey-elves Talath Rhúnen, the East Vale."
From The Silmarillion, Quenta Silmarillion, Ch 14, Of Beleriand and Its Realms